On elasto‐plastic finite element analysis of some frictional contact problems with large sliding

Ling, Wenhua; Stolarski, Henryk K.

doi:10.1108/02644409710170410

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The finite element model is chosen to characterize the responses of the 1 st bodies. Different calculation strategies can be used to treat the problems linked to contacts as described in [38] (penalty [42][43][44][45][46], Lagrange multipliers [47][48][49][50] and Augmented Lagrangian [51][52][53]. In the case of the valve-seat contact we choose the latter one.…”

Section: Presentation Of the Elastic Finite Element (Ef) Modelmentioning

confidence: 99%

Valve-seat components in a diesel engine: a tribological approach to limit wear

Crozet

Berthier

Saulot

et al. 2021

Mechanics & Industry

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Within diesel engines, the valve-seat contact is one of the few non-lubricated contacts which is subjected to significant degradation. This degradation is put in evidence by material removal at the intake valve. The material pull out is promoted by the replication of combustion cycles (500 million) and severe operating conditions (pressure 18 MPa). The wear can lead to gas leakage and engine failure. The target of this work was to identify the main parameters affecting this wear. Our approach was based on the tribological triplet and material flows within the contact involving both numerical and experimental approaches. A dynamic model and a valvetrain test bench showed that the wear flows could be activated by the architecture of the valve opening system. Consequently, the limitation of these flows can be obtained by controlling the “global” geometry of the system and therefore without modifying the properties of the materials. In the same way, a finite element model of the local response of the seat-valve contact highlighted the impact of the “local” geometry of the contact. The change of this geometry is a lever to limit the shearing forces which reduces the tearing of the particles and therefore wear. Finally, tests carried out on the engine and on a specifically adapted test bench completed the understanding of degradation mechanisms (source flow, wear flow, etc.). Morphological interpretations of worn surfaces in terms of material flows allowed the understanding of the build-up stages of a protective layer. One solution to promote this internal flow is the use of pollutants from combustion. For example, the burned oil in contact, which is a priori harmful, becomes an opportunity here. In addition, un-burned hydrocarbons from the combustion of biodiesel help to protect the contact.

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Section: Presentation Of the Elastic Finite Element (Ef) Modelmentioning

confidence: 99%

Valve-seat components in a diesel engine: a tribological approach to limit wear

Crozet

Berthier

Saulot

et al. 2021

Mechanics & Industry

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“…In summary, from Equations (6), (9) and (14), the contact stress acting on a slave node can be described as (denoteḟ 3…”

Section: Friction Stressmentioning

confidence: 99%

“…This is partly due to the iteration solution method and its corresponding serious requirement, such as no drastic change of the contact state and the deformation state and smoother contact surface definition (e.g. Nagtegaal [2], Ling [3]). Although many efforts have been made as above, problems still exist (e.g.…”

Section: Introductionmentioning

confidence: 99%

Finite‐element modeling of multibody contact and its application to active faults

Xing

Makinouchi

2002

Concurrency and Computation

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SUMMARYEarthquakes have been recognized as resulting from a stick-slip frictional instability along the faults between deformable rocks. An arbitrarily-shaped contact element strategy, named the node-to-point contact element strategy, is proposed, applied with the static-explicit characters to handle the friction contact between deformable bodies with stick and finite frictional slip and extended here to simulate the active faults in the crust with a more general nonlinear friction law. An efficient contact search algorithm for contact problems among multiple small and finite deformation bodies is also introduced. Moreover, the efficiency of the parallel sparse solver for the nonlinear friction contact problem is investigated. Finally, a model for the plate movement in the north-east zone of Japan under gravitation is taken as an example to be analyzed with different friction behaviors.

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